At age 16, Kasumi, who lost her father to a stroke, was proposed to by Taisei, the heir of Hanabishi Trading and her childhood crush who is ten years older than her. Thinking it was a proposal out of sympathy for her past traumas, she was struck by his words, "You're the only one I trust, Kasumi," and decided to marry him. Seven years later, Kasumi was troubled by Taisei's reluctance to be intimate with her. Does he have feelings for another woman, making their marriage a hindrance to him? Feeling this way, Kasumi decided to ask for a divorce on the night of their anniversary, only to be passionately embraced by Taisei...!